Apparatus for cleaning of flue gases



July 23, 1946 T. c. BIETH 0 ,3

' APPARATUS FOR CLEANING OF FLUE GASES Filed Nov. 7, 1944 A ,Tom a wzm I fliij.

[WI/EN TU/R Patented July 23, 1946 APPARATUS FOR CLEANING OF FLUE GASES Tom Conrad Bith, Goteborg, Sweden Application November 7, 1944, Serial No. 562,302

In Sweden December 18, 1939 4 Claims. 1

The present invention relates to a new arrangement or apparatus for separating and removing dust from the flue gases being discharged through chimneys. The principal object of the invention is to provide a concentrator for intensifying a dust film along the inner walls of a chimney which when used in combination with a dust collector will more efficiently separatethe dust or heavier solid particles from the flue gases and thereby permit a larger quantity of the gases to be exhausted through the chimney.

Other objects of the invention will be in part obvious and in part hereinafter pointed out as the description continues.

In the drawing:

Fig. 1 is a vertical sectional View of a chimney having my invention applied thereto with the dust collector and circulating fan shown in side elevation.

Fig. 2 is a top plan view.

In the drawing l indicates a conventional sheet metal chimney the upper end of which terminates in an outwardly flared collar 2. Retained in spaced relation above the collar 2 of the chimney is a, cylindrical casing 3 having an inwardly flared collar 4 formed at the lower end thereof and these collars 2 and 4 being so spaced apart as to form annular opening or space 5 therebetween. Secured to the casing 3 is a rlngshaped disc 6 and a corresponding disc 1 is secured to the chimney I and these discs are connected together by means of a cylindrical wall l6 forming a channelway 8 which communicates with the opening 5. Extending tangentially from this channelway 8 is a duct 9 leading to a dust collector I0. Leading from the dust collector is a pipe [I and this pipe H is connected to the suction side of a fan l2.

A pipe I3 leads from the exhaust side of the fan 12 and is in communication with an opening l4 formed within the chimney l and this latter opening is arranged tangentially with relation to the inner circumference of the chimney. Supported centrally within the chimney is an elongated closed body or deflector I! having its larger lower end position above the opening I4 and its upper end tapering to a point located adjacent the upper end of the chimney.

From the foregoing it is obvious that when my improved apparatus is applied to a conventional chimney and the dust collector and fan set in motion, gases will be caused to enter the chimney through the opening I 4 and caused with aid of the elongated body I! to be set up into a centrifugal motion whereby the heavier solid particles of dust will be thrown out against the inner circumference of the chimney and be caused to be drawn upwardly through the latter with the smoke and gases arising through the chimney. This intensified dust film will escape through the annular opening 5 into the channelway 8 where it will be drawn within the dust collector NJ. The dust film will be caused to circulate within the channelway 8 inthe direction of the arrows as shown in Fig. 2 of the drawing and then caused to pass through the duct 9 into the dust separator where the dust film is thoroughly cleaned. The cleaned gas will escape through the pipe H into the fan I! where it will be again forced through the pipe I3 into the chimney. From this arrangement it will be apparent that the solid particles contained within the gas film will be thoroughly separated therefrom and be prevented from exhausting from the chimney which would likely cause a hazard to surrounding buildings or persons.

Whereas in the drawing I have disclosed a single dust collector and fan, any number of fans and dust collectors may be employed as conditions warrant or dictate and further, an adjustable nozzle may be employed in connection with the opening I4 which nozzle may be arranged as may be desired for elfecting a better draught within the chimney.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An arrangement for removing solid particles, particularly dust, from the flue gases in a chimney, comprising a concentrator consisting of a frustrum shaped shell along the inside of which is formed a concentrated dust film, said concentrator forming part of the chimney and being provided with a circumferential slit opening at one end of the concentrator shell, said slit being surrounded by a channel connected to a separate dust collector for removing the dust from said dust film, said dust collector being connected to means for sucking out the cleaned gas and forcing the same back again to the concentrator at a point located in front of said slit, seen in the direction of flow of the, flue gases through the chimney, said cleaned gas entering tangentially into the concentrator shell to set the flue gases in rotation for obtaining said concentrated dust film.

2. An arrangement for removing solid particles, particularly dust, from the flue gases in a chimney, comprising a concentrator consisting of a frustrum shaped shell along the inside'of which is formed a concentrated dust film, said concentrator forming part of the chimney and being provided with a circumferential slit opening at one end of the concentrator shell, said slit being surrounded by a channel connected to a separate dust collector for removing the dust from said dust film, said dust collector being connected to means for sucking out the cleaned gas and forcing the same back again to the concentrator at a 'point located in front of said slit, seen in the direction of flow of the flue gases through the chimney, said cleaned gas entering tangentially into the concentrator shell to set the flue: gases in rotation for obtaining said concentrated dust film, said'inlet opening for the cleaned gas being; combined with nozzles and provided variable as to direction in such a manner thatsaid; gas; is crossing the gas flow through the chimney on a variable distance from the axis of the chimney for regulating the draught.

3, An arrangement for removing solid particles, particularly dust, from the flue gases in a chimney, comprising a concentrator consisting of a frustrum shaped shell along the inside of which isformed a concentrated dust film, said concentrator forming, part ofthe chimney and being provided-with a circumferential slit opening at one endof the concentrator shell, sai-d slit being surrounded by a channel connected toa separate dust collector for removing the, dust from said dust film, said dust'collector' being connected to meansffor-sucking out the cleaned gas and'forcing the same back again to the concentrator at a point located infront of said; slit, seen in the direction of; fiow of the; flue gases through the i chimney, said cleaned gas entering tangentially into the concentrator shell to'set the flue gases in rotation for obtaining said concentrated dust film, a centrally arranged streamline shaped guiding body having its largest diameter located about at the inlet of said cleaned gas and extending to, about said, slit to force the gas towards the inside of said concentrator shell.

4. An arrangement for removing solid particles, particularly dust, from the flue gases in a chimney, comprising a concentrator consisting of a frustrum shaped shell along the inside of which is formed a concentrated dust film, said concentrator formingv part of the chimney and being provided with a circumferential slit opening at one end of the concentrator shell, said slit being surrounded. by a channel connected to a separate dust collector for removing the dust from said dust film, said dust collector being connected to means for sucking out the cleaned gas and forcing the same back again to the concentrator at a point located in front of saidslit, seen in the direction of flow of the flue gases through the chimney, said cleanedgas entering tangentially,

TOM CONRAD' BIETH; 

